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(x + 1)^4 - 6(x + 1)^2 - (x^2 - 2)(x^2 + 2)
= (x^2 + 2x + 1)(x^2 + 2x + 1) - 6(x^2 + 2x + 1) - (x^2 - 2)(x^2 + 2)
= x^2.(x^2 + 2x + 1) + 2x.(x^2 + 2x + 1) + x^2 + 2x + 1 - (x^2 - 2)(x^2 + 2)
= x^4 + 2x^3 + x^2 + 2x^3 + 4x^2 + 2x + x^2 + 2x + 1 - 6x^2 - 12x - 6 - x^2 + 2^2
= 4x^3 - 8x - 1
\(\left(x+1\right)^4-6\left(x+1\right)^2-\left(x^2-2\right)\left(x^2+2\right)\)
\(=\left(x^2+2x-5\right)\left(x^2+2x+1\right)-x^4+2\)
\(=x^4+2x^3+x^2+2x^3+4x^2+2x-5x^2-10x-5-x^4+4\)
\(=4x^3-8x-1\)
a)(3x+4)2-10x-(x-4)(x+4)
9x2+24x+16-10x-x2+16
8x2+14x+32
b)(x+1)(x-2)(x2+1)(x+2)(x-1)(x2+4)
(x+1)(x-1)(x+2)(x-2)(x2+1)(x2+4)
(x2-1)(x2-4)(7x2+4)
(-3x2+4)(7x2+4)
-21x2-12x2+28x2+16
16-x2
a)(3x+4)2-10x-(x-4)(x+4)
9x2+24x+16-10x-x2+16
8x2+14x+32
b)(x+1)(x-2)(x2+1)(x+2)(x-1)(x2+4)
(x+1)(x-1)(x+2)(x-2)(x2+1)(x2+4)
(x2-1)(x2-4)(7x2+4)
(-3x2+4)(7x2+4)
-21x2-12x2+28x2+16
16-x2
3.(x^4+x^2+1)-(x^2+x+1)^2=3.(x^4+2x^2+1-x^2)-(x^2+x+1)^2
=3.((x^2+1)^2-x^2)-(x^2+x+1)^2
=3.(x^2+x+1)(x^2-x+1)-(x^2+x+1)^2
=(x^2+x+1)(3.(x^2-x+1)-(x^2+x+1)
=(x^2+x+1)(2x^2-4x+2)
=(x^2+x+1)(căn 2 .x- căn 2)^2
\(\left(x^2-1\right)^3-\left(x^4+x^2+1\right)\left(x^2-1\right)=x^6-3x^4+3x-1-x^6+1=-3x^4+3x^2\)
\(\left(x+1\right)\left(x+2\right)\left(x^2+4\right)\left(x-1\right)\left(x^2+1\right)\left(x-2\right)=\left(x+1\right)\left(x-1\right)\left(x+2\right)\left(x-2\right)\left(x^2+4\right)\left(x^2+1\right)\)
\(=\left(x^2-1\right)\left(x^2+1\right)\left(x^2+4\right)\left(x^2-4\right)=\left(x^4-1\right)\left(x^4-16\right)\)
(x-2)(x+2)-(x-1)(x+4)
= x2-4 - (x2+4x-x-4)
=x2-4-x2-4x+x+4
=-3x
`(x+2)^2-(x+4)(x+1)`
`=x^2 +2*x*2+2^2 - (x^2+x+4x+4)`
`=x^2+4x+4-x^2-x-4x-4`
`= (x^2-x^2)+(4x-x-4x)+(4-4)`
`= -x`
thank